Drying kiln



E. E. PERKINS.

DRYING.KILN.

APPLICA'HON FILED MAR. 5. 1921.

Lfiwj@ Patented @ammi 2 SHEETSWSHEET l.

E. E. PERKINS.

DHYING KILN.

MPLICAHON FILED MAR.5.192|.

Patented Oct. 3, 192;);l

ZSHEETS SHEET 2 Q Patented @et 355,., 1l

4Appltriatlon filed March 213.921, Serial No. 149,799.

This invention relates to drying kilnsyand While capable of use for drying many articles and. commodities, it is especially Well adapted for drying of painted or varnished articles Vupon which a 'smooth5 glossy iinish is desired.

In drying articles of this character, it.

is essential that the heated air which is circulated Within the room around the articles L` be kept free from dust and other doating particles Which would otherwise collect upon the surfaces of the articles being dried7 thus detracting from the quality of the' finish and luster which it is desirable to impart to such articles.

@ne of theprima-ry purposes of my' present invention is to provide a drying kiln in which the air Will loe Washed and cleaned before being delivered to the drying room9 and which Will be so constructed that a circulation of the air Within the room around the articles to be dried and an inflow of air into the room Will be produced and maintained Without the employment of fans or other forced draft apparatus.

Another object of the invention is the provision of means for ventileucingn the rooml to relieve it ofthe surplus fumes emanating from the articles being dried, which fumes? if permitted to accumulate in excessivequantities,v are detrimental to the drying operation.

A further object is to so arrange the ventilating apparatus that it Will in conjunction with the air supplying apparatus' maintain the requisite circulation oi air Within the room,'and to provide means whereby the rate of circulation and the rate of delivery of the fume laden .air from the room, may loe regulated as desired. n

@ther objects and advantages of this invention should loe readily appreciated as the same becomes better understood, by reference to the ollowin description, when considered in connection With lthe accompanying drawings. i

' Referring to the drawings:

Fig. l is aperspective vievv ot the interior linto the room.

orda dryingy lulu emhodying myinvention; an

Fig'. 2 is asimilar vievv oi amodiiimil n form thereof. Referrin reference c aracter 3 indicates a plurality of Walls separatedfhy dead airrspaces el. which walls in conjunction with the spaces form a heat-insulatedl drying; rrmm7 in which the articles to he dried are positioned. @ther preferred Wall structure be ployed in vlieu of that j shown, it` preferred.

The articles to be dried are placed in the 'room and 'usually are run in on trucks ythrough doors in one of the end Walls el? the room. l v i The air with which the room is supplied is delivered thereinto through a conduit 5 disposed near one of the side walls theretut9k and communicating room through a series of upwardly disposed openings 6. F or the purpose of maintaining' a requisite temperature Within Athe room, .l employ a plurality or steam heating coils ly carried by brackets 8 mounted upon one or thersidevvalls near the floor of the room. Steam in requisite quantities is supplied to the coils from any suitable source, the temperature Within the room being controlled byregulating the steam supply through the v instrumentality of a valve 9 disposed in steam supply pipe, which valve is automat-y ically 4controlled through suitable connecn tions loy a thermostat l1 disposed Within the drying room.

llt Will be observed that the air inlet con duit is disposed in proximity to the heating means so that the heat applied to the con duit, in conjunction Withthe upwardly travsling` current of air produced ny the headingq coils, vvill cause an indovv or air through the conduit Without the employment of fans or other mechanical apparatus for producing a forced draft. 'lhe heating means9 therey -ore, serve not only to maintain the temperature Within vthe drying room, hut

.also to estahlish a circulation of air 'Within the room and to induce a dow of :fresh air in order to avoid the introduction into the room ci dust, dirt, and other matter which might accumulate upon the articles being; dried, and thus detract from the quality of their iin'ishe l have provided means for 'washing and cleaning the air prior toits introduo to the drawings more in det-ail7 with the interim of f requisite I.

rie

ydouble room,

tion to the room. This means, while it may be of any preferred construction, is shown in the present instance as comprising a spray nozzle l12 disposed in a vertical leg 13 of the inlet conduit, water being supplied to this nozzle from any convenient source through a supply pipe 14. The air enters this leg through a lateral inlet opening 15, where it is subjected to the water spray which removes the dust and dirt therefrom, and the water-is collected at the bottom of the leg, from which it is drained off through a drain pipe 16.

F or the purpose of relieving the room of .theobje'ctionable fumes given off by the ar ticles being dried, and further for the purpose of augmenting the circulation within the room, I empl-oy a plurality of ventilating iues 17 which are disposed remotely from the heating means and the air. inlet conduit.

In the construction shown in Fig. 1, these fines are disposed adjacent the opposite side wall from the heating means and intake conduit, whereas in Fig. 2, which illustrates` a the Ventilating flues, indicated in this instance by reference character 18, are disposed in the middle of the room, the objects to be dried being positioned at each side thereof. Referring again to Fig. 1, it will be observed that each flue communicates with the interior of the room through two openings or branches 19 and 21 respectively, located at different elevations from the floor. Each of these branches is provided with a damper, the spindle 22 of which is equipped with a lever 23 connected with an operating rod 24, by means of which all the dampers at one elevation may be simultaneously and equally adjusted. The rate of outiiow of air from the room may, of course, be controlled by regulating these dampers, and customarily, during the initial drying, when the fumes are rapidly given off from the articles and a more rapid circulation is desired, the upper branches 19 are fully opened, and the lower branches 21 may be wholly or partially closed. As the drying operation progresses, it is usually found that the best results are obtained by closing the upper branch-es 19 and opening the lower branches 21. The regulation of the dampers in the Ventilating flues serves, therefore, to regulate the rate of air delivery from the room and also controls the rapidity of the circulation of air within the room.

Referring again to the construction shown in Fig. 2, it will be observed that in thisini stance, both side walls are equipped with heating coils and air inlet conduits, while the Ventilating fines 18 are disposed in the center of the room. These flues. like the fines 17. are equipped with laterally opening branches and 26 respectively` disposed at different elevations, and each of these branches is equipped with a damper connected with operating rods 2.7 by which the dampers may be adjusted from outside the room. The circulation vof air in the room in this instance is upwardly along both side walls, then downwardly in the center to the outlet branches of the Ventilating fines, whereas in a single room structure, such as shown in Fig-1, the air rises at one side of the room only and flows downwardly at the opposite side.

A certain amount of humidity in the ldrying room being conducive to most favorable drying conditions, it is sometimes desirable to start the drying operation with the ventilating flues closed so that vthe moisture given off bythe articles to be-dried may be retained in the room, but when the fumes have accumulated to a considerable extent, it is preferable that they be relieved through the Ventilating flues, as previously explained. The requisite humidity is obtained from the air delivered to the room, and while the air in passing through the washing spray may -be practically saturated at or near the temperature of the water, it will be manifest that as soon as it enters the room where it is heated, the increase in temperature will correspondingly lower its humidityv so that at no time is a condition approaching an undesirable saturation point of the air -obtained in the room, but on the contrary, a relatively low but desirable humidity is secured, which remains practically constant, although it is capable of slight variation by regulation of the air discharge through the Ventilating flues.

'It is believed that my invention and many of its inherent advantages will be understood from the foregoing without further description, and it'should be obvious that the details of construction shown and .described are capable of wide modification without departing from the spirit of the invention as defined in the following claims.

I claim:

1. A drying kiln, comprising a drying room, heating means arranged at one side of said room near the floor, means for delivering air to said room above and in proximity to said heating means, means for washing said air prior to its delivery into said room, and a Ventilating pipe opening into; said room remote from said heating means.

2. A drying kiln, comprising a drying room. air heating means disposed at one side of said room near the fioor, an air inlet conduit opening into said room above and in proximity to said heating means so that an inflow of air into said room is induced by said heating means. means for washing the air prior to its delivery into the room by said conduit, and means remote from said conduit through which air is discharged from said room.

3. A drying kiln, comprising a drying room, an air inlet conduit communicatin with said room near one side wall thereo means for washing the air delivered to said room by-said conduit, heating means positioned below and in roximity to said oonduit to induce an in ow of air through the conduit, Ventilating means having a plurality of communications with said room remote from said heating means, and means for controllino` the delivery of air from the room through said Ventilating means.

4. A drying room, an air lnlet conduit near one side of said room, means for washing the air delivered to the room by said conduit, heating means arranged in proximity to the conduit, a plurality of Ventilating Hues communicating with the interior of said room remote from said heating means, and means whereby the outliow of air from said room through all of said'ventilating conduits may be simultaneously regulated.

5. A drying kiln, comprising a drying kiln, comprising a drying room, an air inlet conduit communicating with said room near one side wall thereof?, heating means arranged below and in proximity to said conduit whereby an inflow of air through the conduit is produced, ventilating means positioned remote from said conduit, and means for controlling the delivery of air from said room through said Ventilating means. v

6. A drying kiln, comprising a drying room, heatmg pipes extending along one side wall of said room near the bottom thereof, an air inlet pipe extending along said wall above said heating pipes, said inlet pipe having a plurality of outlet openings arranged in spaced relation along said pipe` said heating means being adapted to cause an inow of air into the room through said openings, a plurality of Ventilating pipes disposed along the opposite wall of said room and provided with a plurality of openings, and means for regulating the outflow .of air through said ventilatin pipes.

ELMER E. ERKINS. 

